Stock-based Compensation Plans and Awards - Stock options narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock-based compensation expense | $ 128,431 | $ 138,458 | $ 111,645 |
| Stock options | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Granted (in shares) | 2,226,938 | 0 | |
| Stock-based compensation expense | $ 7,600 | $ 13,800 | $ 10,700 |
| Weighted-average fair value of stock option granted (in dollars per share) | $ 5.55 | $ 9.08 | |
| Aggregate intrinsic value of options exercised | $ 15,100 | 17,300 | $ 9,500 |
| Total fair value of options vested | 4,600 | $ 10,200 | $ 17,600 |
| Shares issuable pursuant to the ESPP | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Unrecognized compensation cost | $ 8,100 | ||
| Service period over which company recognizes stock-based compensation (years) | 3 years 6 months 7 days | ||
| X | ||||||||||
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Unrecognized cost of unvested options awarded to employees as compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
|
| X | ||||||||||
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|